Extended Response

Three types of body-cavity organization exist in animals—acoelomate, pseudocoelomate, and coelomate.

Part A Explain how acoelomates and pseudo-coelomates differ from coelomates.

Part B Explain how the lining of the body cavity develops in coelomates.

If you find particular questions difficult, put a light pencil mark beside them and keep working. (Do not write in this book.) As you answer later questions, you may find information that helps you answer the difficult questions.

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